Craftsman 390.251483 Piping in the Well, Emergency Power, Recommended Fusing and Wiring Data

MAJOR COMPONENTS / PIPING

Pressure Switch
The pressure switch provides automatic control.
MODEL NO.	PUMP STARTS AT		PUMP STOPS AT
390.251483	40	PSI	60	PSI
390.251883	40	PSI	60	PSI

Tank

The tank serves two functions. It provides a reservoir of water,

some of which can be drawn through the house fixture before the

pump must start. It maintains a cushion of air under pressure.

Two types of tanks are available. Captive Air _ and Standard. No air

volume control is needed with Captive Air* Tanks.

PIPING IN THE WELL

A shallow well jet pump can be installed on a dug well, drilled well

or a driven point. SEARS shallow well jet pumps have a built-in check valve. In a dug or cased well, a foot valve and strainer should

Horizontal Piping from Well to Pump

On well point installations where the horizontal piping is more

than 25 feet, a check valve should be installed (Figure 3).

When the pump is offset more than 25 feet from the well, hori-

zontal piping should be increased in size to reduce friction losses. Never use offset piping that is smaller than the suction tapping of the pump.

Horizontal Offset Piping Sizes - Shallow Well Jets

Up1-to1/4"25 ft. t 251to-1/2"50 ft. t 50 to2"200 ft.

Discharge Pipe Sizes

When the pump is some distance from the house or point of water

use, the discharge pipe size should be increased to reduce pressure losses.

be installed for easy priming. It should be 5 to 10 feet below the lowest level to which the water will drop while pump is operating

(pumping level) (Figure 1).

The strainer should not be too close to the bottom, or sediment may clog.it. Before installing foot valve, check to see that it works freely.

When using a foot valve, a priming tee and plug must be included (Figure 2).

Be sure the vertical distance (lift) from the priming level to pump

is not over 20 feet, if the pump is over well. This will be less if pump is offset from the well. Both figures are for sea level. The

maximum lift of any pump decreases with the elevation above sea

level. This decrease is at the rate of 1 foot per 1000 feet of eleva-

tion. For example, the lift is 17 feet and your elevation is 3000 feet

above sea level. You would then be pumping 17 plus 3, or 20 feet.

This is still satisfactory for shallow well pumping.

1"

Up to 25 ft.

1-1/4"

Plastic Pipe

T

5'TOtO'

Pumping Lovel

1

1-1/4"		1-1/2"
25 tolOOft.	T	100 to 600 ft.
Well Seal		._aValve
Pipe
Plastic		NOTE: Check
		C_leck
		valve useO _f how
		zontal p_ping _s 25
		or more
1-1/4"		Steel
		Drive
		Pipe
Foot Valve
		Drive
		Coupling

EMERGENCY POWER

In some areas and with some installations, an emergency power supply to guard against power failure is a good idea. If you install

an engine-generator set for emergency backup power for your

pump, supply the generator set manufacturer with the nameplate data from the pump motor. He will then be able to provide a gen- erator of the correct size to power your pump. Also, be sure to add

the load from any other accessories (such as lights) that may be on the same circuit.

Well Point

DUG OR CASED WELL

DRIVEN POINT

FIGURE I FIGURE 3

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FIGURE 2

	RECOMMENDED			FUSING AND WIRING DATA
						Distance in Feet From Motor to Meter
					Branch	Oto	51 to	101 to	201 to
	Motor		Max. Load		Delayed Fuse	50	100	200	300
Pump Model	Horsepower	Volts	Amperes		Rating Amps		Wire Size
390.251483	1/2	115/230	10.5/5.2		1_15	14/14	14/14	10/14	8/14
390.251883	3/4	115/230	12.4/6.2		20/15	12/14	12/14	10/14	8/14

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